Concise hierarchy

(Domain) Bacteria - (Phylum) Spirochaetes - (Class) Spirochaetes

Subsequent positions

Spirochaetes (Class) Cavalier-Smith 2002

Ref: T. Cavalier-Smith, 2002a: 11. [assumed]

Current position

Spirochaetes (Class) Cavalier-Smith 2002

Ref: J.P. Euzéby, 2016: [1 Sep 2017].

Alternative positions

Schizomycetes (Class) Nägeli 1857 (Approved Lists 1980)	Ref: 1976: 186.
Scotobacteria (Class) Gibbons and Murray 1978 (Approved Lists 1980)	Ref: N.R. Krieg & J.G. Holt, 1984-1989
Spirochaetes (Class) Cavalier-Smith, 2002	Ref: G.M. Garrity et al., 2007: 543.
Spirochetes ([unranked])	Ref: E. Canale-Parola, 1982: 30.

Historical positions

Spirochaetes (Class) Cavalier-Smith 2002	Ref: J.P. Euzéby, 2016: [1 Sep 2017].
Spirochaetes (Class) Cavalier-Smith 2002	Ref: M.A. Ruggiero et al., 2015b: table 2 (p. 6).
Spirochaetes (Class) Cavalier-Smith, 2002	Ref: G.M. Garrity et al., 2007: 543.
Spirochaetes (Class) Cavalier-Smith 2002	Ref: T. Cavalier-Smith, 2002a: 11. [new position]
Spirochaetes (Class) Cavalier-Smith, 2002	Ref: G.M. Garrity et al., 2001b: 24.
Scotobacteria (Class) Gibbons and Murray 1978 (Approved Lists 1980)	Ref: N.R. Krieg & J.G. Holt, 1984-1989
Spirochetes ([unranked])	Ref: E. Canale-Parola, 1982: 30.
Schizomycetes (Class) Nägeli 1857 (Approved Lists 1980)	Ref: 1976: 186.

Number of Subtaxa

2024	Available in Systema Naturae 2000	2f;10g;84s;5ss
1989-present	Systema Naturae 2000	4f;14g;105s;5ss
2016	J.P. Euzéby: [13 Sep 2017]	[2f;11g]
2007	G.M. Garrity et al.	[3f;13g;97s;5ss]
2001b	G.M. Garrity et al.: 24	[3f;13g]
2000		3f13g
1982	E. Canale-Parola	5g